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2 năm trước
Bài 18 : Giải hệ phương trình sau : a/ (x-12)/4 = (y-9)/3=z-1 và 3x+5y-z =2 b. (a+b)/6 = (b+c)/7=(a+c)/8 và a+b+c =14 gíup mk vs vote 5 * + câu trả lời hay nhất
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